Mm 67896 manual cherry pick onto release 10.11 (#35989)

* improves time limit checks

* consistently check for presence of patch fields

* fix variable shadowing in test

* allow idempotent pinning operations with time limit expired

* new utility function for post limit time check

* fix style issue

* Add missing E2E CI files and delivery-platform migration for release-10.11

- Add calculate-playwright-results and calculate-cypress-results GitHub Actions
  (referenced by e2e-tests-playwright-template.yml and e2e-tests-cypress-template.yml
  but never backported to release-10.11)
- Add e2e-tests/playwright/merge.config.mjs (required by merge-reports step)
- Add run-specs Makefile target and server.run_specs.sh (required by run-failed-tests job)
- Fix merge-shard-results step: pin @playwright/test version and add fallback
  for when no blob reports exist (json reporter output used directly)
- Remove pull_request trigger from e2e-tests-ci.yml (delivery-platform migration)
- Remove dead e2e-fulltests-ci.yml and e2e-tests-ci-template.yml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: yasserfaraazkhan <attitude3cena.yf@gmail.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/actions/calculate-playwright-results/action.yaml

@@ -0,0 +1,53 @@
+name: Calculate Playwright Results
+description: Calculate Playwright test results with optional merge of retest results
+author: Mattermost
+
+inputs:
+  original-results-path:
+    description: Path to the original Playwright results.json file
+    required: true
+  retest-results-path:
+    description: Path to the retest Playwright results.json file (optional - if not provided, only calculates from original)
+    required: false
+  output-path:
+    description: Path to write the merged results.json file (defaults to original-results-path)
+    required: false
+
+outputs:
+  # Merge outputs
+  merged:
+    description: Whether merge was performed (true/false)
+
+  # Calculation outputs (same as calculate-playwright-test-results)
+  passed:
+    description: Number of passed tests (not including flaky)
+  failed:
+    description: Number of failed tests
+  flaky:
+    description: Number of flaky tests (failed initially but passed on retry)
+  skipped:
+    description: Number of skipped tests
+  total_specs:
+    description: Total number of spec files
+  commit_status_message:
+    description: Message for commit status (e.g., "X failed, Y passed (Z spec files)")
+  failed_specs:
+    description: Comma-separated list of failed spec files (for retest)
+  failed_specs_count:
+    description: Number of failed spec files
+  failed_tests:
+    description: Markdown table rows of failed tests (for GitHub summary)
+  total:
+    description: Total number of tests (passed + flaky + failed)
+  pass_rate:
+    description: Pass rate percentage (e.g., "100.00")
+  passing:
+    description: Number of passing tests (passed + flaky)
+  color:
+    description: Color for webhook based on pass rate (green=100%, yellow=99%+, orange=98%+, red=<98%)
+  test_duration:
+    description: Test execution duration from stats (formatted as "Xm Ys")
+
+runs:
+  using: node24
+  main: dist/index.js